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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT Security Bulletin ASB-2020.0036 Mozilla Foundation Security Advisory 2020-06 13 February 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mozilla Firefox Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Cross-site Scripting -- Remote with User Interaction Denial of Service -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2020-6800 CVE-2020-6799 CVE-2020-6798 CVE-2020-6797 CVE-2020-6796 Member content until: Friday, March 13 2020 OVERVIEW Vulnerabilities have been fixed in Mozilla Firefox ESR68.5 [1] IMPACT Mozilla has given the following information regarding these vulnerabilities: "Announced February 11, 2020 Impact high Products Firefox Fixed in Firefox ESR68.5 # CVE-2020-6796: Missing bounds check on shared memory read in the parent process Reporter Thomas Imbert Impact high Description A content process could have modified shared memory relating to crash reporting information, crash itself, and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable crash. References o Bug 1610426 # CVE-2020-6797: Extensions granted downloads.open permission could open arbitrary applications on Mac OSX Reporter Vladimir Metnew Impact moderate Description By downloading a file with the .fileloc extension, a semi-privileged extension could launch an arbitrary application on the user's computer. The attacker is restricted as they are unable to download non-quarantined files or supply command line arguments to the application, limiting the impact. Note: this issue only occurs on Mac OSX. Other operating systems are unaffected. References o Bug 1596668 # CVE-2020-6798: Incorrect parsing of template tag could result in JavaScript injection Reporter terjanq Impact moderate Description If a <template> tag was used in a <select%gt; tag, the parser could be confused and allow JavaScript parsing and execution when it should not be allowed. A site that relied on the browser behaving correctly could suffer a cross-site scripting vulnerability as a result. References o Bug 1602944 # CVE-2020-6799: Arbitrary code execution when opening pdf links from other applications, when Firefox is configured as default pdf reader Reporter Joshua Graham & Brendan Scarvell Impact moderate Description Command line arguments could have been injected during Firefox invocation as a shell handler for certain unsupported file types. This required Firefox to be configured as the default handler for a given file type and for a file downloaded to be opened in a third party application that insufficiently sanitized URL data. In that situation, clicking a link in the third party application could have been used to retrieve and execute files whose location was supplied through command line arguments. Note: This issue only affects Windows operating systems and when Firefox is configured as the default handler for non-default filetypes. Other operating systems are unaffected. References o Bug 1606596 # CVE-2020-6800: Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5 Reporter Mozilla developers and community Impact high Description Mozilla developers and community members Raul Gurzau, Tyson Smith, Bob Clary, Liz Henry, and Christian Holler reported memory safety bugs present in Firefox 72 and Firefox ESR 68.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. References o Memory safety bugs fixed in Firefox 73 and Firefox ESR 68.5" [1] MITIGATION It is recommended to upgrade Firefox to the latest version. REFERENCES [1] Mozilla Foundation Security Advisory 2020-06 https://www.mozilla.org/en-US/security/advisories/mfsa2020-06/ AusCERT has made every effort to ensure that the information contained in this document is accurate. However, the decision to use the information described is the responsibility of each user or organisation. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXkSnfWaOgq3Tt24GAQj0zhAA0lzLSMfuLe4FBerTVDFt/S054GzHV/B+ SwF4Gcvu3YrkVQhVg2zwEZZWQv/KrBhRtXTY2NKo3BOmKtQrRTPkXJPhR8UTyo+S Dr4uMhj244Z7+PvDqQStvGj+bCno2a1LU/8MA9H5l7R7iovHpXD6g6v0de8dzmLX KtG7DTPf6PMmEEA+N3Smr2JKX4gaEn0VG/MSxwfHsbc+BdKSf3f6YJ7pgQ02t08o w7ttC2qYKIcq44BMVDOF2T9mYjH9NwjF1Etu8kQr1pzi5Fy4pKnQ2l7wtVWzsHUk bMxdeYbAdWBy+PUey0A1MAmXANe3kLjLAosad44l54Q0ZZr2NRqlWhoEDSbWFlmG xzkGa7hEHhtdWsLUkK/X9c2bu2qaDOI5+6F5c4gbC1XO1qetRUPNNI28BN2bKOX6 pHHcR3j/vgH9ZN3M25nGblkHcM4pt7dwL/qtUDbmFaDyYQNYdutK08acGwwwA1Cu anXLKTfAB6CmkNC90Zm78AI2kHPwMXWz/sb7ll6Ou13sf4QnPjIfxpmydfWp08nl 65EhrrAOCWzJ+QtCG3hM/8gkzCyaz+gXF80ZmVEdqMhM/zpdhU6VEe/dAHwwVf+J IYrApcNXzRBp0l2yI4RYKk6modHVfcqYrRjT5Pm8eAPIjFPTOg2HxzRMDG5YcWzT 2RIuFrm0ouE= =AC92 -----END PGP SIGNATURE-----